Smart contact lenses and also smart built-in lenses that work like cataract surgery lenses.
These are given away free and basically make traditional optometry have to change to a lower volume higher cost model. We also outlaw lasik on the grounds that it is more dangerous than smart lense implants.
The smart lenses track you and interact with personalised location specific advertiser content at each surveillance point, allowing them to show ads directly to your retina.